suction cup definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a rubber cup that will stick to a surface by creating a vacuum in the area it covers
suction cup definition by American Heritage Dictionary
A cup-shaped device, usually of plastic or rubber, designed to adhere to a flat surface by means of suction.